User:Samiye Yaman/Notebook/Lab 581/2012/10/03

Objective

Description

Part A

• Dynamic Mechanical Analyzer was used to find out the stiffness and flexibility of each films.(width 5.3 mm)

• DMA of 22,000 film was measured.(without crosslinking)

• DMA of 100,000 film wihout cross-linking will be done next week.

• Following films were cross-linking(kept at 120C for 90min) for DMA.
• 100,000 PVOH
• 22,000 PVOH
• 100,000 PVOH with a drop of HCL
• 22,000 PVOH with H3Po4 and maleic acid
• 22,000 PVOH with H3Po4 with H3PO4.

Data

• After the cross-linking, films became stiffer and their color was not clear as before.

• After the cross-linking, film of 100,000 became dark black.

• DME result for PVOH(required)

Individual observations of films after

Films

• 22,000 PVOH: less clear film. Slight change in stiffness.

• 22,000 PVOH with H3PO4 and maleic acid : less clear film. Slight change in stiffness.

• 22,000 PVOH with H3PO4: yellowish color, stiffness increased dramatically. It can be still bended.

• 100,000 PVOH: less clear film. Very stiff. Harder to bend.

• 100,000 PVOH with HCl: Dark Black color. still flexible. Stiffness did not change to much.

Notes

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